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Microchip Technology MSL2023-INR
- Part No.:
- MSL2023-INR
- Manufacturer:
- Microchip Technology
- Category:
- LED Drivers
- Package:
- 24-VFQFN Exposed Pad
- Datasheet:
-
MSL2023-INR.pdf
- Description:
- IC LED DRIVER OFFL PWM 24VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,473
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Product details
Overview
MSL2023-INR from Microchip Technology (formerly Atmel) is a dual-string LED driver IC designed for high-CRI, 2-color LED luminaires. It integrates a precision linear current controller for the main (white) LED string and a floating buck controller for the color-adjust (e.g., amber/red) string, both driving external N-channel MOSFETs. Key confirmed specs: ±3% LED current accuracy, 100:1 dimming range, 400Hz phase-shifted register-controlled PWM, I²C interface with EEPROM, and -40°C to +105°C operation - enabling stable tunable-white lighting in architectural downlights and PAR lamps.
For engineers reviewing the MSL2023-INR datasheet, MSL2023-INR pinout, MSL2023-INR application, or MSL2023-INR equivalent, this page delivers verified technical context, real-world design meaning of specifications, validated pin functions, and actionable alternative part guidance - all grounded in the official 42063A–LED–02/2013 datasheet and Microchip product documentation.
Technical Context
The MSL2023-INR implements adaptive headroom control via its FBO (Feedback Output) pin, which dynamically regulates the voltage supplied to the main LED string by interfacing with AC/DC or DC/DC converters - minimizing power loss across the linear current sink. Its proprietary efficiency optimizer algorithm supports ultra-low-bandwidth topologies including single-stage PFC flyback controllers.
It features two independent current regulation loops: a high-accuracy linear controller (S/G/D pins) for the main string with 8-bit DAC-adjustable 200mV current sense threshold, and a constant off-time floating buck controller (DRV/CS/TOFF pins) for the color-adjust string, where off-time is set externally via RTOFF and peak current is controlled by an 8-bit DAC referencing 200mV at CS.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| LED String Configuration | Dual independent strings: main (linear current sink) + color-adjust (floating buck), enabling tunable-white and high-CRI blending |
| Current Accuracy | ±3% over temperature (-40°C to +105°C), achieved with internal 200mV reference and 8-bit DAC trimming - ensures consistent lumen output without calibration |
| PWM Dimming | 400Hz register-controlled, 180° phase-shifted dimming for both strings - eliminates beat frequencies and enables smooth analog-like dimming without audible noise |
| Dimming Range | Over 100:1 (0.024% to 100% duty resolution) - supports deep dimming in hospitality and residential applications requiring low-light ambiance |
| Interface & Memory | I²C (0.05–1 MHz) with on-chip EEPROM for persistent register storage - allows factory-programmed settings and eliminates MCU dependency for basic operation |
| Fault Protection | Dedicated open/short detection per string with open-drain FLTB output and readable fault status register (0x23) - enables fail-safe shutdown and diagnostics without external circuitry |
| Supply Range | 9.5V to 15V AVIN/PVIN - compatible with standard 12V industrial LED power supplies and isolated AC/DC front-ends |
Pinout & Package
MSL2023-INR is housed in a thermally enhanced 24-pin 4×4 mm QFN package with exposed pad (EP), optimized for high-power LED driver thermal management in compact luminaires.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FBO (Pin 1) | Efficiency Optimizer Feedback Output | Drives AC/DC converter feedback node to dynamically adjust VLED; sets minimum overhead voltage to minimize linear regulator loss - critical for >90% system efficiency |
| EN (Pin 2) | Enable Input (Active High) | Initiates full turn-on sequence including EEPROM load, 250ms startup delay, and EO optimization - enables soft-start and system-level power sequencing |
| S (Pin 18) | Main String Source Sense | Connects to source of main-string MOSFET and current-sense resistor; regulates current via 200mV threshold - defines LED current with ±3% accuracy using 1% RS |
| G (Pin 19) | Main String Gate Drive Output | Drives gate of external N-MOSFET up to VIN − 2.0V; supports logic-level FETs - eliminates need for level-shifting in 12V systems |
| DRV (Pin 15) | Color-Adjust Buck Gate Drive | High-side gate driver for floating buck MOSFET; operates referenced to PGND - enables buck topology without isolated gate drive |
| CS (Pin 13) | Color-Adjust Current Sense Input | Monitors source voltage of color-adjust buck FET; default 200mV threshold adjustable via CAREF register - enables precise current matching between strings |
| TOFF (Pin 10) | Buck Off-Time Set Input | Resistor-to-ground sets constant off-time (e.g., 45.3kΩ = 0.5µs); determines switching frequency inversely with input voltage - ensures stable ripple current independent of VLED |
| FLTB (Pin 6) | Fault Indicator (Open Drain) | Pulls low on open/short LED faults or overtemperature; cleared via EN toggle or I²C - provides immediate system-level fault signaling without polling |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive Headroom Control | Reduces linear regulator power dissipation by dynamically lowering VLED to just above required forward voltage - extends thermal margin in enclosed fixtures |
| Phase-Shifted Dual PWM | 180° out-of-phase 400Hz dimming eliminates current ripple summation in shared input rails - prevents EMI spikes and input capacitor stress |
| Floating Buck Topology | Enables color-adjust string regulation from main-string rail without isolation - simplifies BOM and layout vs. separate DC/DC converters |
| I²C-Accessible 8-bit DACs | Independent MREF and CAREF registers allow fine-tuning of both string currents post-manufacture - supports binning compensation and field calibration |
| Integrated Fault Detection | Hardware-monitored open/short conditions per string with dedicated FLTB output - eliminates need for external comparators or MCU GPIO monitoring |
Applications
| Architectural Downlights | High-CRI Retail Lighting |
|---|---|
Use Scenario: Recessed ceiling fixtures requiring tunable CCT (2700K–5000K) and >90 CRI for accurate merchandise rendering. IC Role / Device Role / Timing Role: MSL2023-INR drives white and amber LED strings independently, with adaptive VLED control and phase-shifted PWM to maintain spectral stability across dimming range. Use Value: Enables precise color mixing without microcontroller intervention; ±3% current matching ensures consistent chromaticity at all brightness levels. |
Use Scenario: Track-mounted display lighting in luxury retail environments where color fidelity and flicker-free dimming are mandatory. IC Role / Device Role / Timing Role: MSL2023-INR acts as the primary LED current controller, coordinating main white and red/green strings via I²C-configurable DACs and EEPROM-persistent settings. Use Value: 100:1 dimming range and 400Hz PWM eliminate visible flicker and enable smooth transitions from showroom-bright to ambient mood lighting. |
| PAR30/38 Lamps | Commercial Office Tunable-White |
Use Scenario: Retrofit PAR lamps replacing halogen, requiring high lumen density, thermal resilience, and compatibility with TRIAC dimmers via external MCU. IC Role / Device Role / Timing Role: MSL2023-INR serves as the analog-current-control engine, interfacing with MCU-generated PWM signals while managing MOSFET gate drive and fault reporting. Use Value: -40°C to +105°C rating and integrated thermal shutdown ensure reliability in enclosed, high-temperature lamp housings. |
Use Scenario: Smart office ceiling panels with daylight harvesting and occupancy-based CCT adjustment via DALI or wireless gateway. IC Role / Device Role / Timing Role: MSL2023-INR executes closed-loop current control for dual LED strings, with I²C allowing dynamic reconfiguration of MREF/CAREF registers during operation. Use Value: On-chip EEPROM stores calibrated current values per CCT setting, enabling instant recall without host MCU firmware updates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-string LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IS31FL3742A | Integrated 18-channel linear LED driver with PWM dimming; no floating buck stage - requires separate DC/DC for second string | Lacks adaptive headroom control and dual-string voltage optimization; suited for low-voltage RGBW modules, not high-power tunable-white | Select when driving multiple low-current LEDs from fixed 5V/12V rails; avoid for high-efficiency, high-CRI luminaires needing VLED optimization |
| LM3445MM | AC/DC controller with analog dimming only; no I²C, no dual-string current control, no EEPROM - requires external current sinks | Designed for single-string constant-current operation with TRIAC/0–10V dimming; no color-mixing capability | Choose for cost-sensitive single-color LED drivers where digital control and tunable-white are unnecessary |
Compared with IS31FL3742A and LM3445MM, the MSL2023-INR uniquely combines adaptive headroom optimization, phase-shifted dual PWM, and floating buck architecture - making it the only option among the three that delivers true high-CRI tunable-white performance with minimal external components and no MCU dependency for core functionality.
Availability
MSL2023-INR is available at Aetrix Electronics and suitable for architectural downlights, high-CRI retail lighting, and PAR lamp designs requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MSL2023-INR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Microchip Technology is a global semiconductor company specializing in microcontrollers, analog devices, and timing solutions, with a strong heritage in LED driver innovation through its acquisition of Atmel.
The MSL2023-INR belongs to Microchip's high-CRI LED driver product line, engineered specifically for tunable-white luminaires demanding precision current matching, adaptive efficiency optimization, and robust fault handling in commercial and architectural lighting.
FAQ
What is the key functional difference between MSL2023-INR and MSL2024-INR?
The MSL2023-INR uses register-controlled 400Hz phase-shifted PWM dimming for both LED strings, while the MSL2024-INR accepts external PWM inputs (PWM1/PWM2) with wider frequency ranges (60Hz–22kHz for main, 100Hz–500Hz for color-adjust). The MSL2023-INR eliminates the need for external PWM generation hardware, making it ideal for MCU-constrained or cost-sensitive designs where fixed-frequency dimming is acceptable. Both share identical pinout, package, and core regulation architecture.
Does MSL2023-INR support dimming below 1% duty cycle?
No - the MSL2023-INR datasheet explicitly states that PWM duty cycles between 0% and 1% are not guaranteed. Its 12-bit PWM registers provide 0.024% resolution, but reliable operation begins at ≥1% duty cycle. For deep dimming applications requiring sub-0.5% light output, system-level solutions such as multi-stage dimming or auxiliary low-current strings must be implemented alongside the MSL2023-INR.
How does the MSL2023-INR achieve ±3% current accuracy without external calibration?
The MSL2023-INR achieves ±3% current accuracy through a combination of on-die 200mV reference voltage with low temperature drift (-220 ppm/°C), matched internal DAC architecture, and factory-trimmed analog blocks - all validated across -40°C to +105°C. When paired with a 1% external current-sense resistor (RS), the total system error remains within ±3%, eliminating the need for per-unit calibration or external precision references.
Can MSL2023-INR drive both LED strings from separate power supplies?
Yes - the MSL2023-INR supports independent power rails: AVIN (analog supply, 9.5–15V) powers internal regulators and logic, while PVIN (12V nominal) powers the DRV gate driver for the color-adjust buck stage. The main string linear controller operates from the regulated VLED rail controlled via FBO, which may originate from a separate AC/DC converter. This separation enables flexible system partitioning and improved noise isolation between analog and power domains.
What failure modes trigger the FLTB pin, and how is fault recovery handled?
The FLTB pin asserts low for three confirmed fault conditions: color-adjust string open circuit (bit 1 of FAULTSTAT), color-adjust string short circuit (bit 0), and die temperature exceeding 147°C (TSD bit). Recovery is achieved either by toggling EN low-then-high to reset the device, or by clearing fault bits via I²C writes to the FAULT register (0x22). The I²C interface remains active during thermal shutdown, enabling remote diagnostics without power cycle.
MSL2023-INR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 24-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- AC DC Offline Switcher
- Topology:
- Flyback, Step-Down (Buck)
- Internal Switch(s):
- No
- Number of Outputs:
- 2
- Voltage - Supply (Min):
- 9.5V
- Voltage - Supply (Max):
- 15V
- Voltage - Output:
- -
- Current - Output / Channel:
- -
- Frequency:
- -
- Dimming:
- PWM
- Applications:
- Lighting
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-VQFN (4x4)
MSL2023-INR FAQ
1.How can I place an order for MSL2023-INR through Aetrix?
Please submit a Request for Quotation (RFQ) for MSL2023-INR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MSL2023-INR reliable?
The price and inventory of MSL2023-INR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MSL2023-INR is usually 5 days.
3.What payment methods are accepted for MSL2023-INR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MSL2023-INR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MSL2023-INR?
MSL2023-INR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MSL2023-INR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MSL2023-INR?
For technical support, including MSL2023-INR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MSL2023-INR requirements.
6.How does Aetrix verify that MSL2023-INR is sourced from the original manufacturer or authorized distributors?
All MSL2023-INR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MSL2023-INR meets industry standards.
7.What is the process for return or replacement of MSL2023-INR?
All MSL2023-INR units undergo pre-shipment inspection (PSI). If there is an issue with MSL2023-INR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MSL2023-INR part is unused and in its original packaging.
Return procedure for MSL2023-INR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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